Haas formed a team with Shelton Benjamin and the two debuted on SmackDown in December 2002. They won the WWE Tag Team Championship twice, and dubbed themselves The World's Greatest Tag Team before they split in 2004. Haas won the WWE Tag Team Championship once more with Rico, and gained Miss Jackie, whom he later married, as a valet. Haas then transferred into singles competition before being released from WWE in 2005. After a short stint in Jersey All Pro Wrestling (JAPW) and other independent promotions, Haas was re-signed to WWE in April 2006. He formed a short-lived team with Viscera, before reforming the World's Greatest Tag Team with Benjamin. After Benjamin transferred to the ECW brand, Haas began wrestling with a comical luchador persona, before developing a character where he imitated other wrestlers and WWE Hall of Famers. In addition, Haas won the last ever match on WWE Heat when the show ended on May 30, 2008.

Haas was released from WWE in February 2010. He soon returned to the independent circuit, including returning to JAPW and appearing for Ring of Honor. In September 2010, he won the NWA Texas Heavyweight Championship. On April 1, 2011, Haas and Benjamin won the ROH World Tag Team Championship and held it until December 2011. Haas announced his retirement from professional wrestling in March 2013, but returned to competition in August that same year. Aside from wrestling, Haas and his wife Jackie run a nutritional store, Custom Muscle Nutrition and Smoothie Shop, in Frisco, Texas, which they opened in October 2008.[5]

The Haas brothers began competing for Combat Zone Wrestling (CZW) in November 1999, losing to The King Pinz at The War Begins on November 20, 1999.[7] They competed regularly for CZW throughout early 2000, and won the CZW World Tag Team Championship on February 12 at Climbing The Ladder by defeating The Kashmerino Brothers and The Thrill Kill Kult in a three-way match.[8][9] On July 10, they lost the championship to The Backseat Boyz at Caged To The End, when Johnny Kashmere defeated Russ in a singles match and was awarded the championship.[8][10]

Haas was later involved in an angle in which he was in a love triangle with Miss Jackie, who was acknowledged on-screen as his fiancée, and Dawn Marie.[23] The storyline culminated when Haas served as the special-guest referee in a match at Armageddon 2004 between the two women.[24] After the match, Haas left both women in storyline, although he continued his relationship with Miss Jackie off-screen. In early-2005, he formed a tag team with Hardcore Holly.[25][26] They were involved in a feud (scripted rivalry) with MNM for the WWE Tag Team Championship, but never won the championship.[27][28]

He returned to JAPW later in July 2005,[31] and began a feud for the JAPW Heavyweight Championship with Jay Lethal. On September 10 at JAPW Haas of Pain, Lethal defeated Haas to retain his title.[31] In JAPW, on October 27, 2007, Haas was inducted along with his late brother Russ into the first class of the Jersey All Pro Wrestling Hall of Fame.[32]

Haas returned to WWE in 2006, appearing on the April 17, 2006, episode of Raw as Rob Van Dam's handpicked opponent for his former partner, Shelton Benjamin. Haas defeated Benjamin in the ensuing match.[38] Haas continued to wrestle on the lower midcard spot, becoming a regular fixture on Heat.[2]

On the June 5, 2006 episode of Raw, Haas inadvertently knocked Lilian Garcia off the ring apron as he was entering the ring.[39][40] It was announced on WWE's official website that as a result, Garcia suffered a sprained wrist.[39] As a result of the legitimate accident, Haas began a feud with Garcia's onetime storyline love interest Viscera.[41][42] Haas made advances towards Garcia, at one point forcefully kissing her and then dropping her to the ground.[43][44] Haas and Viscera continued to fight for Garcia's affection in the ring, until she told them both that she wanted to be "just friends".[45] Haas gave Viscera an eye rake in anger, and a blinded Viscera accidentally gave Garcia a Samoan drop.[45] Though it was unintentional, when both Haas and Viscera had seen what had happened to their now former love interest, they simply had a laugh about it, thus making Haas a villain.[45] After that, Viscera and Haas became a tag team, competing on both Raw and Heat until splitting in December 2006.[2][46][47]

Early in 2008, Haas developed a gimmick in which he would go under the ring in the middle of his matches and re-emerge wearing a mask.[59] In this "alter-ego", Haas would sometimes perform luchador-esque maneuvers in a comical fashion (such as attempting a diving splash, but instead landing on his feet and hitting a standing splash).[60] The opponent would often unmask Haas mid-match, returning him to his normal demeanor.[59] During this persona, Haas usually competed in dark matches before the live broadcast of Raw or on Heat.[2]

On April 15, 2009, Haas was drafted to the SmackDown brand as part of the 2009 Supplemental Draft.[64] On the May 8, 2009 episode of SmackDown, Haas made his in-ring return to the brand as a heel, abandoning his persona of imitating other wrestlers, and losing to John Morrison in a match where he was accompanied by his former World's Greatest Tag Team partner, Shelton Benjamin.[65] The following week on the May 15, 2009 episode of SmackDown, Benjamin and Haas unofficially reunited and competed against John Morrison and CM Punk in a losing effort, but Benjamin was traded to the ECW brand in June.[66][67]

After an absence of several months, Haas made his return to television by teaming with Mike Knox in a losing effort against Cryme Tyme on the December 31, 2009 episode of Superstars.[68] On February 28, 2010, WWE announced that Haas had been released from his contract.[69]

On September 11, 2010, Haas and Shelton Benjamin made their debut as Wrestling's Greatest Tag Team in Ring of Honor (ROH) losing to The Kings of Wrestling at the Glory By Honor IX pay-per-view.[80] They returned to ROH at the Ring of Honor Wrestling television tapings on December 9, where they defeated the Bravado Brothers (Harlem and Lance).[81] The following day, at the second set of television tapings, Haas and Benjamin defeated the All-Night Xpress of Kenny King and Rhett Titus, and participated in an eight-man tag team match, teaming with the Briscoe Brothers against the Kings of Wrestling and the All-Night Xpress, which ended in a no contest.[82] At the Final Battle 2010 pay-per-view on December 18, Haas and Benjamin announced they would be wrestling regularly for ROH in 2011.[83] At the following pay-per-view, 9th Anniversary Show, on February 26, 2011, Haas and Benjamin defeated the Briscoe Brothers in the main event of the evening to earn another shot at the Kings of Wrestling and the ROH World Tag Team Championship.[84][85] On April 1, at the first night of the Honor Takes Center Stage pay-per-view, Haas and Benjamin defeated the Kings of Wrestling to win the ROH World Tag Team Championship.[86] On June 26 at Best in the World 2011, Haas and Benjamin successfully defended the ROH World Tag Team Championship in a four-way match against the Briscoe Brothers, the Kings of Wrestling and the All-Night Express.[87] The following day ROH announced that both Haas and Benjamin had signed contracts with the promotion.[88] At Final Battle 2011, Haas and Benjamin lost the ROH World Tag Team Championship to the Briscoes despite severely attacking them before the match started, turning them into villainous characters.[89] On May 12, 2012, at Border Wars, Haas and Benjamin regained the ROH World Tag Team Championship from the Briscoe Brothers.[90] On June 24 at Best in the World 2012, Haas and Benjamin lost the title to Kenny King and Rhett Titus.[91] Shortly after their loss, Benjamin was suspended in storyline, to explain his absence while wrestling in Japan. Benjamin returned at the Death Before Dishonor X pay-per-view, accompanying Haas and Rhett Titus in a tag team championship match. Following Death Before Dishonor, Haas and Benjamin would continue to feud with Titus and his new tag team partner B.J. Whitmer defeating them at Glory By Honor XI. They defeated them again in a street fight at Final Battle, where Haas won the match after sent BJ against a table. On February 2, 2013, Haas turned on Benjamin during an ROH World Tag Team Championship match against the Briscoe Brothers.[92] He continued his feud with BJ, fighting in the 11th Anniversary Show in a No Holds Barred Match. BJ won the match when the referee stopped the match.

On March 30, 2013, Haas announced his retirement from professional wrestling which coincided with him leaving Ring of Honor. However, a few months later Haas returned to the ring and has continued to compete in various promotions in his home state of Texas, Oklahoma and in Canada.[93][94]

Haas competed in amateur wrestling during high school, and for Seton Hall University, where he attended on a wrestling scholarship.Cite error: A <ref> tag is missing the closing </ref> (see the help page). Haas was a two-time Big East Champion at Seton Hall and graduated with a degree in economics and business.[95] He then became a stockbroker with Goldman Sachs.[3] According to Haas via the Q&A section on his website, he is a devout Christian.[96] Following the death of his brother, Haas has wrestled with Russ (his brother's name) written on his wrist tape as a tribute. Since 2002 he has maintained a close friendship with his longtime tag team partner Shelton Benjamin, who he often refers to as his brother. Benjamin also served as Haas's best man at his wedding to Jackie Gayda.

His grandfather, Hugh Devore, was an assistant with the Houston Oilers and a former Head Coach of the Notre Dame Fighting Irish.[97] Haas' brother Russ was also a professional wrestler, until his death in 2001 due to a heart attack.[11] After getting engaged in September 2004, Haas married fellow wrestler Jackie Gayda on June 10, 2005.[2][98] Their first child, daughter Kayla Jacquelyn Haas, was born on December 14, 2006.[99] The couple's second daughter, Taylor Suzanne, was born on September 17, 2008.[5][100] On June 1, 2010, the couple's third child, son Thomas Russell Haas, was born.[101] Haas and his wife opened "Custom Muscle Nutrition and Smoothie Shop", a nutritional store in Frisco, Texas on October 1, 2008.[5] On July 23, 2012, Haas announced the birth of his fourth child.[102]

On August 30, 2007, an article on Sports Illustrated's website named Haas as one of ten superstars found to have purchased illegal steroids not in compliance with WWE's Talent Wellness program. He was allegedly prescribed anastrozole, somatropin, stanozolol, nandrolone, and chorionic gonadotropin between August 2006 and January 2007.[103][104] Haas later said that he thought it was legal, and he was doing it for "maintenance" after he had both his knees reconstructed.[61]